Process of producing articles of quartz glass.



O. C. TRAUTMANN. PROCESS OF PRODUCING A'RTICLES 0F QUARTZ GLASS.

APPLICATION FILED AUG. I0. 1916.

Patented Feb. 13, 1917.

OTTO C. TRAUTMANN, OF NEW YORK, N. Y., ASSIGNOR TO SIDIO COMPANY OF AMERICA,

INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

PROCESS OF PRODUCING ARTICLES 0F QUARTZ GLASS.

Specification of Letters Patent.

Patented Feb. 13, 1917.

Application filed August 10, 1916. Serial No. 114,105.

To all whom it may concern:

3e it known that I, Orro C.'TRAUTMANN, a citizen of the United States, and a resident of New York city, New York and State of New York, have invented certain new and useful Improvements in Processes of Producing Articles of Quartz Glass, a specification. r This invention relates to processes of producing articles of quartz glass, particularly quartz glass vessels.

In producing a quartz glass vessel, it has hitherto been necessary to introduce a blast of air into the interior of the plastic quartz body before it has had a chance'to cool. This required the introduction of pipes and apparatus in the interior of the furnace Iwhich is impracticahdue to the extreme eat.

. The present invention has for its object to devise a process whereby the vessel may be blown without any special apparatus and without requiring any handling, involving loss of time. In the production of quartz glass bodies, the time element is portant for the reason that the plastic can be worked only within a small range of temperature, as will be understood by those skilled in the art.

7 In the accompanying drawing illustrating diagrammatically one form of apparatus for carr in on in im roved rocess ,V g y Figure 1 is a sectional elevation of a furnace showing the plastic formed around the resistance core.

Fig. 2 is a section taken along line 22 of Fig. 1. v

Fig. 3 is a sectional elevation of the furnace with the resistance core broken and the mold closed.

Fig. 4 is a of Fig. 3.

In carrying out my improved process,the quartz is first fused in an electric furnace consisting preferably of a shell 10 lined with suitable heat resisting material 11. The base of the furnace is closed by a conductor 12 and at the top of the furnace is a conducting head 13 between which is positioned the resistance core 14. The latter is reduced in section at the intermediate ends thereof section taken along line 44 as at 15 for the purpose hereinafter set forth. Suitable devices as set screws 16 hold the core in place.

in the county ofof which the following is very 7 im vessels consisting in fusing t mass about the resistance core,

The quartz sand is introduced into the furnace, the resistance core is properly clamped in place and the current turned on.

he plastic mass of quartz 17 soon forms about the core. Vhen the requisite amount of plastic is formed, a door 18 at the bottomof the furnace is opened, permitting the surplus sand to escape. Thereupon the two movable parts 19 and 20, having a suitable concavity 21, 22, are actuated by any suitconcaved portions 21, 22 form a mold about I the plastic as illustrated in Figs. 3 and 4.

t is now necessary to produce an interior pressure so as to expand the plastic into the mold. This is accomplished as follows:

The upper portion of the resistance core 14 may be twisted or strain otherwise applied'thereto, as by means of the tongs 25, so as tobreak the core at the weakened portion 15. The portions of the core may then be separated slightly, forming an are 26, as clearly appears in Fig. 3. The gases gen-' erated by the are then produce a pressure sufficient to force the plastic into the mold, as will be readily understood.

he entire manipulation requires ve tle time, and during the entire period? current may be continued so that the plastic mass is kept up to the proper temperature at which it can be readily shaped. Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The process of formin litthe quartz glass e quartz material in an electric resistance furnace and then transfo'rmmg the resistance furnace lnto an arc furnace whereby gases are generated bythe arc to form a ressure to expand the plastic into a mold 2 The process of forming quartz glass vessels consisting in heating quartz material in a resistance furnace to form a plastic removing the quartz material, and then transforming the resistance furnace into an arc furnace whereby gases are generated b the arc to form a pressure'to expand the p astic into a mold.

3. The processvessels consisting rial in a resistance furnace to form mass about the resistance core, removing the" unfused quartz material, positioning a mold unfused of forming quartz glass 1n heating quartz mate-.- a plastic i two portions about the plastic, and then transforming the l'CSlSlLElIlCC furnace llltO an ELFC furnace "Wl'lBI'Q- rial in an electric resistance furnace around a resistance core, applying torsion upon the resistance core so as to break the same into two portions and drawing the portions out into an arc to generate gases to create a pressure in the interior of the plastic body.

Signed at New York city, in the county of New York and State of New York, July, A. D. 1916.

one o. TRAUTMANN.

\Vitnesses 2 NATHAN Connn, D. B. KLEIN. 

